title: Initiation of sexual intercourse among middle school adolescents: the influence of psychosocial factors.
mesh_terms: D000293:Adolescent; D000428:Alcohol Drinking; D003075:Coitus / Q000523:psychology*; D005006:Ethnicity; D005260:Female; D006801:Humans; D008297:Male; D009515:New Jersey; D011584:Psychology; D012309:Risk-Taking; D012746:Sexual Abstinence; D019966:Substance-Related Disorders